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Download Lab 9 Nervous histology post lab answer key 2010
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LABORATORY 9 Nervous System Histology 1. Label the structures of the neuron Clockwise from upper left: dendrite, soma (perikaryon), node of Ranvier, axon terminal, nucleus of Schwann cell (neurilemma ok too), Schwann cell (myelin sheath ok), axon hillock, nucleus 2. Match the term with the description: a. b. c. d. e. neurofibril Schwann cell axon hillock dendrite Nissl bodies f. axon g. telodendria h. node of Ranvier i. axon terminal j. soma e, Nissl bodies rough endoplasmic reticulum found in the cell body; also called chromatophilic substance because of its affinity for basic dyes i, axon terminal distal endings of axon terminal that store neurotransmitter d, dendrite neuronal process that acts as a receptive area for incoming stimuli b, Schwann cell neuroglial cell that surrounds and forms myelin around larger nerve fibers in the peripheral nervous system j, soma biosynthetic center of a neuron; contains the nucleus, nucleolus and ribosomes g, telodendria terminal branches of an axon h, node of Ranvier gaps in a myelin sheath a, neurofibril bundles of intermediate filaments that, along with microtubules, help to maintain the shape of a neuron c, axon hillock the cone shaped area of the cell body that gives rise to an axon f, axon neuronal process that generates action potentials and propagates them, typically away from the cell body 3. What is a nerve? A bundle of axons found in the peripheral nervous system. 4. Match the term with its description. Each term can be used more than once. a) mulitpolar neuron b) bipolar neuron c) unipolar neuron (pseudounipolar neuron) C unipolar sensory neurons of the peripheral nervous system in which a single process is attached to the cell body; the process divides to form a peripheral process and a central process A multipolar major type of neuron in the central nervous system B bipolar has two processes attached to the cell body, a single axon and a single dendrite A multipolar has a single axon and two or more dendrites attached to the cell body B bipolar act as receptor cells for special sense organs, such as the eye and nose A multipolar act as motor (efferent) neurons, transmitting impulses away from the central nervous system to effectors 5. What is the location of each nerve connective tissue layer listed below? Endoneurium: surrounds the axon Epineurium: surrounds the entire nerve Perineurium: surrounds the axon fascicles